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Monolithic acoustically-treated composite structures and methods for fabricating the same are provided. A monolithic acoustically-treated composite structure comprises an internal frame assembly comprising a unitary composite frame structure and at least one acoustic panel assembly. The unitary comp

Monolithic acoustically-treated composite structures and methods for fabricating the same are provided. A monolithic acoustically-treated composite structure comprises an internal frame assembly comprising a unitary composite frame structure and at least one acoustic panel assembly. The unitary composite frame structure defines a shape of the monolithic acoustically-treated composite structure to be fabricated. A composite overlay covers the internal frame assembly. The method for fabricating the monolithic acoustically-treated composite structure comprises forming the unitary composite frame structure, including the at least one acoustic panel in the unitary composite frame structure, and covering the internal frame assembly with the composite overlay.

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1. A monolithic acoustically-treated composite structure comprising: an internal frame assembly comprising a unitary composite frame structure and at least one acoustic panel assembly included in the unitary composite frame structure, the at least one acoustic panel assembly includes an acoustic cor

1. A monolithic acoustically-treated composite structure comprising: an internal frame assembly comprising a unitary composite frame structure and at least one acoustic panel assembly included in the unitary composite frame structure, the at least one acoustic panel assembly includes an acoustic core having a plurality of cells with a first end and a second end and a perforated acoustic facesheet having a front surface including a peripheral border portion surrounding an interior portion and a rear surface bonded to the first end of the acoustic core, the unitary composite frame structure defining a shape of the monolithic acoustically-treated composite structure, the unitary composite frame structure defining a perimeter mounting surface, with the front surface of the perforated acoustic facesheet coupled to the perimeter mounting surface such that the second end of the acoustic core extends outwardly from the unitary composite frame structure; anda composite overlay covering the internal frame assembly. 2. The monolithic acoustically-treated composite structure of claim 1, wherein the internal frame assembly defines an interior surface, the interior surface having a contoured or planar configuration which is substantially free of surface discontinuities. 3. The monolithic acoustically-treated composite structure of claim 1, wherein the unitary composite frame structure comprises a plurality of interconnected frame members that cooperate to define at least one side opening in the unitary composite frame structure, an acoustic panel assembly of the at least one acoustic panel assembly extending across a side opening of the at least one side opening to complete a side panel of the internal frame assembly. 4. The monolithic acoustically-treated composite structure of claim 3, wherein the perforated acoustic facesheet has a plurality of spaced perforations. 5. The monolithic acoustically-treated composite structure of claim 4, wherein each side opening is surrounded by the perimeter mounting surface for mounting the peripheral border portion thereto, the acoustic core extending outwardly and rearwardly from the rear surface of the perforated acoustic facesheet. 6. The monolithic acoustically-treated composite structure of claim 5, wherein the plurality of interconnected frame members comprises a plurality of side frame members extending between upper and lower frame members, each side frame member of the plurality of side frame members comprising a pair of narrow side flanges, each narrow side flange of the pair of narrow side flanges extending along a side edge of a respective side opening and a side edge of a respective adjacent side opening and the upper and lower frame members each comprising a narrow flange portion that extends respectively along a top edge and a bottom edge of each side opening, the narrow flange portion of each of the upper and lower frame members and a narrow side flange of the pair of narrow side flanges of a pair of side frame members cooperating to form the perimeter mounting surface surrounding each side opening. 7. The monolithic acoustically-treated composite structure of claim 6, wherein the perimeter mounting surface defines an open relief pocket for the acoustic panel assembly. 8. The monolithic acoustically-treated composite structure of claim 1, wherein each acoustic panel assembly included in the unitary composite frame structure forms an acoustically-treated area of the monolithic acoustically-treated composite structure. 9. A monolithic acoustically-treated composite structure comprising: a unitary composite frame structure that includes a plurality of interconnected frame members that define at least one perimeter mounting surface;at least one acoustic panel assembly included in the unitary composite frame structure forming an internal frame assembly, each acoustic panel assembly comprising an acoustic core having a plurality of cells with a first end and a second end and a perforated acoustic facesheet, the perforated acoustic facesheet having a front surface including a peripheral border portion surrounding an interior portion that forms an interior surface portion of the monolithic acoustically-treated composite structure and a rear surface bonded to the first end of the acoustic core, with the front surface of the perforated acoustic facesheet coupled to the at least one perimeter mounting surface such that the second end of the acoustic core extends outwardly from the plurality of interconnected frame members of the unitary composite frame structure; anda composite overlay covering the internal frame assembly. 10. The monolithic acoustically-treated composite structure of claim 9, wherein the internal frame assembly defines an interior surface comprising the interior surface portion, the interior surface having a contoured or planar configuration which is substantially free of surface discontinuities. 11. The monolithic acoustically-treated composite structure of claim 9, wherein the plurality of interconnected frame members cooperate to define at least one side opening in the unitary composite frame structure, an acoustic panel assembly of the at least one acoustic panel assembly extending across a side opening of the at least one side opening to complete a side panel of the internal frame assembly. 12. The monolithic acoustically-treated composite structure of claim 11, wherein the perforated acoustic facesheet has a plurality of spaced perforations. 13. The monolithic acoustically-treated composite structure of claim 12, wherein each side opening is surrounded by a respective one of the at least one perimeter mounting surface for mounting the peripheral border portion thereto, the acoustic core extending outwardly and rearwardly from the rear surface of the perforated acoustic facesheet. 14. The monolithic acoustically-treated composite structure of claim 13, wherein the plurality of interconnected frame members comprises a plurality of side frame members extending between upper and lower frame members, each side frame member of the plurality of side frame members comprising a pair of narrow side flanges, each narrow side flange of the pair of narrow side flanges extending along a side edge of a respective side opening and a side edge of a respective adjacent side opening and the upper and lower frame members each comprising a narrow flange portion that extends respectively along a top edge and a bottom edge of each side opening, the narrow flange portion of each of the upper and lower frame members and a narrow side flange of the pair of narrow side flanges of a pair of side frame members cooperating to form the perimeter mounting surface surrounding each side opening. 15. The monolithic acoustically-treated composite structure of claim 14, wherein the perimeter mounting surface defines an open relief pocket for the acoustic panel assembly. 16. The monolithic acoustically-treated composite structure of claim 9, wherein each acoustic panel assembly included in the unitary composite frame structure forms an acoustically-treated area of the monolithic acoustically-treated composite structure.